<template>
  <view>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(itm,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
        
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">yyy</view>
        <!-- 二级分类标题 -->
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
            <!-- 三级分类列表 -->
            <view class="cate-lv3-list">
              <!-- 三级分类item项 -->
              <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                  <image :src="item3.cat_icon" mode=""></image>
                
              </view>
              
            </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //当前设备可用高度
        wh:0,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad(){
       const sysInfo = uni.getSystemInfoSync()
       this.wh = sysInfo.windowheight
       this.getCateList()
    },
    methods:{
      //获取分类列表的数据
      async getCateList(){
        //const {data : res} =await  uni.$http.get('/api/public/v1/categories')
        const {data:res} = await uni.request({url:'https://api-hmugo-web.itheima.net/api/public/v1/categories'})
       // ('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active = i
        //为二级分类重新赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item){
        url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
      }
      
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
  
    .left-scroll-view {
      width: 120rpx;
      
      .left-scroll-view-item {
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active {
        background-color: #3399CC;
        position: relative;
        
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0%;
          transform: translateY(-50%);
          
        }
      }
      }
    }
  }
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      width: 33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
</style>
